Scarifier.



H. C. CLAY.

SCAHIFIER.

APPLICATION FILED SEPT. 3. 1914. 1,155,795. Patented im. 5, 1915.

2 SHEETS-SHEET l.

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H. C. CLAY.

SCARIFIEH.

APPLlcArloN min sEPT.3.1914.

1,155,795. Patented 001;. 5, 1915.

2 SHEETSSHEET 2.

UNITED STATES PATENT OFFICE BARRY C. CLAY, F COLUKBUS, HDIANA, ASSIGNOR TO EHEYBSGN-BRANTINGHAH 00mm, 0F BOCKFOBD, ILLINOIS, CORPORATION 0F ILLINOIS.

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1.155.795. ma f um Patel*- Patented Oct. 5, 1915.

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To'all whom it may concern.' Shoe and means for attaching the same to Beit known that I, Ham C..C LAY, a citizen of the United States, residing at Columbus, in the county of Bartholomew and State of Indiana, have invented certain new and useful Improvements inv of which the following is a spemcation This invention relates to improvements in scali 0 attachments such a areuappheg toroadengmes' orpowerroa roersan are used'in tearing up old roads 'by means of teeth which are `forced into and .through the surface of the Ed for leveling and *lic-oltre 0f Same- The ject of the invention is to provide a device which shall be simple in eonstrtion, easy to manipulate, and effective and economical in operation.

Heretofore scarifying attachments for mad rollers have been known which are characterized by the employment of a toothed-bar ed from the rear end of the road roller and attached to the latter by pivoted draft bars, with a power cylinder supplied by steam roin the bo1ler of the machine for both and lowering toothed bar and ir vieldably holding the latter to its work.

The scarifier of my present invention employs a power cylinder for` lowering the toothed bar to working tion and for yieldably holdingit to its work; but for raising thetoothed and holding 1t in elevated or idle position, my invention employs one or more constantly acting springs: and, in its preferred form, the connections between such spring or and the toothed hat are such that the initial tension of the spring or springs is just slightly in excess of the power required to hold said parts elevated. and the said connections. during the lowering of the tootlfed bai', pre- Sent a continuonsl)Y decreasing leverage to the spring that is substantially proportional to the continuously increasing tension of the spring as it stretches, so that the lifting elect of the pull of the spring is substantially uniform and constant in all positions of the toothed bar and its suspending means Another object of the invention is to provide a new. simplified and improved means for attaching (preferably adjustahly) th scarifying teeth to the transverse har which supports and carries them.

Another object is to provide :in improved seats for the scarifyin the toothed bar of the scariier.

My invention, its mode of operation, and the benets and advantages attending the same, will be readily understood when considered 1n connection with the accompanymg in which I have illustrated one practical mechanical embodiment of the invention, and in which Figure 1 is a top plan view of the rear end of a road engine showing my improved scarifier appliedthe-reto, the view partly in horizontal -section on the line 1-1 o f Fig. 4. Fig. 2 is a detail horizontal section on the line 2-2 of Fig. 5. Fig. 3 is a perspective detail of one of the toothed bar shoes, llustratinthe adjustable attachment of the same to t e toothed bar, and showing an end fragment of the latter in vertical section. Fig. 4 is a vertical section on the line 4-4 of Fig. 1, and showing the toothed bar and its suspending means in full ele rated position: Fig. 5 is a View simi r to Fig. 4, but showing the toothed har and its suspending means in fully lowered position.

Referring to the drawings, 1 designates the boiler, 2 the ground wheels. 3 the axle of the ground wheels journaled in bean 4 ciired to the boiler wing-plates 5, al as usual in road rollers of this type.

6 designates a rearwardl extending lat form that, with its side walls 7, is securgd to the axle bearing l and to the boiler Wingplates 5.

8 designates a cylinder that is secured to' the underside of the platform 6 and to the axle bearing 4.

9 designates a shaft that is journaled in bearings 10 carried by the side plates 7, on the outer ends of which shaft are fixed arms 1l. 'from the outer ends of which latter depend links l2 that are pivotally connected at their lower ends to a V-shaped transverse har 13. (ln the forward face of the har 13 are cast grooved lugs 14 (Fig. 2) that form teeth 15. The lugs 14 are apertiired and t ie front edges of the p teeth are notched :is shown in 16 to receive U-bolts 17 b v which said teeth are strongly and adjiistahly held on the bar 13. On the ends of the bar 13' are mounted a pair of shoes 18, the Shanks 19 of which are channeled as shown in Fig. 3. to receive the ends of the bar 13. this latter being adjiistably secured to t-he Shanks of the shoes by bolts bar and its passing through end anges 13' of the bur 13 and through :my of a series of holes 21 in the Shanks of the shoes. The penetratmg depth of the teeth 1.3 um be determined either by adjustment of said teeth on the bar 13 or by adjustment of the bar 13 on the shoes 18, or by both.

0n the front face of the bar 13 are a pair of ears 22 (Fig. 2) to which are rigidly secured by bolts 23 a pair of draw bars 24. which latter are pivotally connected at Z5 to the wing-plates Fast-'on the shaft 9. between the side plates are a pair of, crank arms 26. to thottter ends of which are pivoad links -4, the inner ends of said links being connetted to the outer ends of a pair of. coil Springs 28. which latter are anchored at their inner ends to lugs 29 secured to the headof the boiler 1. The constant effort of the 28 is to raise and hold raised suspending means; and the initial th of the springzisslightly inelxmofiatre quired for this By referring to Fig. 4 it will be seen thatthe springs are acting at the maximum leverage aorded bythecnnkztorockshaftinadiction to raise the scarifying bar. s the latter is lowered. the leverage of the arms 26 graduall) and continuously decreases. and this decrease in leverage. is substantiallyr proportional to the graduall inc tension of the `springs, with thi result thatthelifting:energy'ofthearms,l1issnb` stantialb unifonn and constant in all of its angular positions. In this connection it may be noted that. the purpose of the links 27 is simply to permit the ams 26 bo swing downwardly enough to reduce the leverage to the required amount without interferenee between the springs and shaft 9. Wthinthecylinderisaplrugerw that is urnneeted by a connecting 31' to theonterendofacrankarmfaston theshaftSbetweenthecrankarms. The inner end of cylinder 8 communicates with .the boiler l through a steam slpply pipet in whid is a three-way valve 3l opera b v a 35: said valve when turned to o3 the boiler and exhausting the steam the cylinder. The outward move.L t of the pllmger is limited by a plate 36 that is secured to the outer open of the cylinder S- idle 'tion of the device is illustrated in Fig. 4. When the devine is to be put in tion. the vulve handle is turned to admit steam to the cylinder S. whereupon the parts at once asume the working position Suhstantiall)Y fb' shown 1n 5. during which movement the spnngs 2S are stretched but without imposing :my increasing hack drug on the shaft 9 hy reason of the decreasing leverage of the arms #G alread'v referred to. Vinile the machine ls m operation the steam power on the pi5 ton 30 acts as :1 cushion to permit the scirifyxng bar to yield upwardly in the event of ymeeting a hard and unyielding obstacle such as would be likely to break the teeth. 'hen the operation is finished. the valve handle is turned in the opposite direction to open the cylinder 8 to the exhaust, and the springs 28 at once return the scarifying har and its suspending parts to the elevated or idle position shown in Fig. -L lt will thus be evident that the fluid pressure is used onlyY to overcome the slight resistance of the springs 28 in lowering the device on to the ground and to hold the teeth into the surface of the roadwhile the spring force is used in holding the levier up automatically 'from the road. being always ready to perform its function whether the Huid pressure is on or ol. This arrangement makes possible the use of a trunk pis ton or plunger whit. n iminates the use of :l Stalling box and also cnwhead and guides to resist the angular thrust of the. connecting rod- While the work is in progress the scarifying bar frequently has to l held up from the surface of the road as well as on the surface of the road. and since the fluid prenre is used on one side only of the piston. there is le of the fluid used. as compared with double-acting c vl inders. notwithanding the piston has to have a little exoe area to overmme the spring force in addition to performing the work of forcing the teeth into the road. which spring force is a small item in comparison with the preure exerted on the teeth by the plunger.

While l have described what I regard as a preferred embodiment of the invention. it willbemanifesttothoseskilledintheart that this embodiment may be changed and modilied more or les in detail without involving any departure from the principle of the invention or sacrificing anv of the ad' vantages thereof. Hence I do not limit the invention to the particular form shown and described. except to the exten clearly indicated in specific claims.

I claiml. The combination with a road engine. of a scarifying attachment therefor comprising a toothed member suspended transversely beneath the rear of said engine. draw bars secured to said toothed member y and pivotally connected to said engine. a spring for raising'said toothed member and its suspending means. connections between Suid spring and said toothed member nffording a decreasing leverage for the' spring as the latter is in lowering the toothed member onto the ground, and fluid pressure operated means for holding said toothed member on the ground in opposition to the action of said spring.

2. The combination with a road engine of a scarifying attachment therefor comprising a toothed member suspended transversely beneath the rear of said engine, draw bars secured to said toothed member and pivotally connected to said engine, a spring for raising said toothe`d member and its suspending means, connections lbetween said spring and said toothed member ati'ording a decreasing leverage for the spi-ing that is .substantially proportional to its increasing tension as it is stretched in lowering the toothed member onto the ground, said spring having an initial tension but slightly in excess of that required to hold Nriid toothe in excess of that required to hold said toothed member and its suspending means in raised position, and fluid pressure operated means for holding said toothed membero'the'grond in opposition to the action of said spring.

3. The combination with a road engine, of a sacrificing attachment therefor comprising a toothed bar located transversely beneath the rear of said engine, draw bars secured to said toothed bar and pivotally connected to said engine, a rock-shaft journaled above and parallel with said toothed bar, rearwardly extending arms -on said rock-shaft, links connecting said arms with said toothed bar, another arm on said rockshaft, and a spring between the free end of said last named arm and a stationary part of the engine. said last namedarm being so positioned on said rock-shaft as to extend substantially at right angles to the axis of said spring when said toothed bar is fully raised and at an acute angle'to the axis of said spring when said toothed bar is engaged with the ground, and fluid pressure operated means acting to turn said rookshaft, in opposition to the etfo'rt of said spring, in a direction to lower said toothed bar and yieldably hold the same in engagement with the ground.

4. The combination with a road engine of a scarifying attachment-` therefor comprising a toothed bar located transversely beneath the rear of said engine, draw bars secured to said toothed bar and pivotally connected to said engine, a rock-shaft journaled above and parallel with said toothed.

bar, rearwardly extending arms on said .rock-shaft, links connecting said arms with l HARRY o. CLAY. Witnesses:

Lars BRUCE,

ALBERT T. CLAY.

Corrections in It-is hereby certied that in Letters Patent No. 1,155,795, granted October, 1915,- upon the application of Harry C.C1ay, of Columbus, Indiana, forau improvement Vin Scarifiers, errors appear in the printed specification requiring correction as follows: Page 3, claim 2, strike out line 19; same page, line 27, claim 3, for the word "sacrifcing read scariifying. und that the said Letters Patent should be read with these corrections therein that the same may conform to the record of thc case in the Patent Office. p

Signed and Sealed this 2nd day f Nrwembcr, A. D., 1915.

[SEAL] R. F. WHITEHEAD,

Acting Commissioner of Patents. 

